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add cpu kdtree version please do the test on linux to see whether it works or not See merge request !13
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replace ANN by kdtree. hi See merge request !12
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implementing finding eigenvalue and eigenvector for 3x3 matrix. hi, I implemented the eigenvalue and eigenvector as well as the variance tensor part. Fixed some minor error in matrix_sym.h when using in cooperating with matrix.h. See merge request !11